I honestly have no idea, but he seems to be asleep in his main burrow now so I'm happy. He has been building a nest under & around the wheel this week, maybe he realized that's what was slowing it down? Could have been trying to make a new sleeping spot.
It was so adorable when he asked me to fix it. I offered him all his things and he wasn't interested, then he made a point to hop onto the wheel and back onto my hand. When I started fixing it, he sat on the bendy bridge and stared at it. Was so cute when he tried the wheel again, he was pleased and investigated it like "hey, how did you do that?"